How in hell are any of these laws to be enforced? The states where they have been enacted don't have enough money in the state coffers to competently educate children, much less put pee-pee police on duty at every public restroom in the state.
Let's take a look at a hypothetical situation. An MtF who passes about 50% of the time needs to use the facilities while shopping at the local mall. She enters the ladies room, proceeds directly to an empty stall, then locks the door and does her business. After flushing and, most importantly, making sure the back of her skirt isn't tucked inside her pantyhose, she exits the stall and goes directly to the sink to wash hands. So far, so good, right? But now comes the danger point. A cis-woman at a nearby sink, while looking in the mirror, realizes her expectation does not match her reality at that moment. If she doesn't bodyslam our mythical transperson onto the cheap tile floor (ouch), our heroine can simply exit the restroom and proceed on her business; her sole remaining challenge—the mall cop. At that point it's probably best to find someplace else to shop.
Obviously there are variations on this scenario, and the slim possibility of being arrested exists. But that's worst case. Transwomen who function successfully in their daily lives are unlikely to be challenged. Women's restrooms are more social than men's rooms, but generally no one gets into anyone else's business. If you're unlucky enough to encounter the town busybody, leave.
The one thought I'd like y'all to remember is:
These measures are all for show, 'cause they ain't got the dough.
*Those of you not in the United States must be laughing your butts off at us. I don't mean to make light of the situation, but the likelihood of bathroom laws surviving legal challenge is really slim. Until that day comes, some will find using public facilities daunting. I sympathize. Ultimately we win, they lose. Hang tough.